Which of the following statements BEST describes a bimodal distribution?

An X-bar and R chart with n=5 has been plotted for some time and has demonstrated random variation. Upon review of the last 30 plot points, the expected number of runs around the centerline on the X-bar chart is expected to be approximately which of the following?

Which of the following are the MOST logical reasons for providing source inspection?
. The supplier has consistently shown poor out-going quality.
. The key inspection points are hidden after assembly at the suppliers' plant.
. The supplier requests the inspection to save them potential shipping expenses.
. The criticality of the product warrants it.

Given the following probabilities
1 or more defects = .70
2 or more defects = .35
3 or more defects = .15
4 or more defects = .03
What is the probability of 2 or fewer defects?

Analysis of data on all product returns is important because
I. Failure rates change with length of product usage.
II. Changes in design and in customer use are often well reflected.
III. Immediate feedback and analysis of product performance becomes available.